Plastic bobbin carrier

A one-piece plastic bobbin carrier for taking up threads and yarns, said plastic bobbin carrier being in the form of a substantially cylindrical shell having radial openings therein and first and second ends, said shell comprising:

• first and second end rings at said first and second ends of said shell, said first and second end rings having radially inwardmost surfaces;
• an outer winding surface;
• a substantially cylindrical inner surface;
• a plurality of shell segments spaced apart from one another, said shell segments having inner and outer surfaces, said outer surfaces defining said outer winding surface of said shell, and said inner surfaces defining said inner surface of said shell;
• a plurality of supporting webs joining said shell segments together, said supporting webs being continuous and extending from said first end ring to said second end ring, said supporting webs having a cross section which diminishes in one direction over their length, said supporting webs resting on said inner surface of said shell segments and being formed in one piece with said shell segments, and said supporting webs protruding radially over said radially inwardmost surface of at least one of said first and second end rings.

A one-piece plastic bobbin carrier for taking up threads and yarns, said plastic bobbin carrier being in the form of a substantially cylindrical shell having radial openings therein and first and second ends, said shell comprising:

• first and second end rings at said first and second ends of said shell, said first and second end rings having radially inwardmost surfaces;
• an outer winding surface;
• a substantially cylindrical inner surface;
• a plurality of shell segments spaced apart from one another, said shell segments having inner and outer surfaces, said outer surfaces defining said outer winding surface of said shell, and said inner surfaces defining said inner surface of said shell;
• a plurality of supporting webs joining said shell segments together, said supporting webs being continuous and extending from said first end ring to said second end ring, said supporting webs extending helicoidally between said first and second end rings and having a cross section which diminishes in one direction over their length, said supporting webs resting on said inner surface of said shell segments and being formed in one piece with said shell segments, and said supporting webs protruding radially over said radially inwardmost surface of at least one of said first and second end rings.

A one-piece plastic bobbin carrier for taking up threads and yarns, said plastic bobbin carrier being in the form of a substantially cylindrical shell having radial openings therein and first and second ends, said shell comprising:

• first and second end rings at said first and second ends of said shell, said first and second end rings having radially inwardmost surfaces;
• an outer winding surface;
• a substantially cylindrical inner surface;
• a shell segment in the form of a winding extending spirally between said first and second end rings, said winding having a plurality of turns spaced apart from one another, said turns of said shell segment having inner and outer surfaces, said outer surfaces defining said outer winding surface of said shell, and said inner surfaces defining said inner surface of said shell;
• a plurality of supporting webs joining said turns of said shell segment together, said supporting webs being continuous and extending from said first end ring to said second end ring, said supporting webs having a cross section which is constant over their entire length, said supporting webs resting on said inner surface of said turns of said shell segment and being formed in one piece with said shell segment, and said supporting webs protruding radially over said radially inwardmost surface of at least one of said first and second end rings.